Bo Liu 32c5fc10e7 mm: remove incorrect swap_count() from try_to_unuse() ... In try_to_unuse(), swcount is a local copy of *swap_map, including the SWAP_HAS_CACHE bit; but a wrong comparison against swap_count(*swap_map), which masks off the SWAP_HAS_CACHE bit, succeeded where it should fail. That had the effect of resetting the mm from which to start searching for the next swap page, to an irrelevant mm instead of to an mm in which this swap page had been found: which may increase search time by ~20%. But we're used to swapoff being slow, so never noticed the slowdown. Remove that one spurious use of swap_count(): Bo Liu thought it merely redundant, Hugh rewrote the description since it was measurably wrong. Signed-off-by: Bo Liu <bo-liu@hotmail.com> Signed-off-by: Hugh Dickins <hugh.dickins@tiscali.co.uk> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: stable@kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2009-11-02 09:44:41 -08:00
..
allocpercpu.c	percpu: use dynamic percpu allocator as the default percpu allocator	2009-06-24 15:13:35 +09:00
backing-dev.c	backing-dev: ensure that a removed bdi no longer has super_block referencing it	2009-10-29 11:46:12 +01:00
bootmem.c	kmemleak: Do not report alloc_bootmem blocks as leaks	2009-08-27 14:29:17 +01:00
bounce.c	block: remove some includings of blktrace_api.h	2009-06-16 11:19:36 +02:00
debug-pagealloc.c
dmapool.c	dmapools: protect page_list walk in show_pools()	2009-06-30 18:56:00 -07:00
fadvise.c	readahead: move max_sane_readahead() calls into force_page_cache_readahead()	2009-06-16 19:47:28 -07:00
failslab.c
filemap_xip.c	const: mark struct vm_struct_operations	2009-09-27 11:39:25 -07:00
filemap.c	const: mark struct vm_struct_operations	2009-09-27 11:39:25 -07:00
fremap.c
highmem.c	block: remove some includings of blktrace_api.h	2009-06-16 11:19:36 +02:00
hugetlb.c	const: mark struct vm_struct_operations	2009-09-27 11:39:25 -07:00
hwpoison-inject.c	HWPOISON: Add simple debugfs interface to inject hwpoison on arbitary PFNs	2009-09-16 11:50:17 +02:00
init-mm.c	mm: consolidate init_mm definition	2009-06-16 19:47:28 -07:00
internal.h	mm: move highest_memmap_pfn	2009-09-22 07:17:41 -07:00
Kconfig	Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc	2009-10-29 08:59:06 -07:00
Kconfig.debug	trivial: improve help text for mm debug config options	2009-09-21 15:14:57 +02:00
kmemcheck.c	kmemcheck: add hooks for the page allocator	2009-06-15 15:48:33 +02:00
kmemleak-test.c	percpu: clean up percpu variable definitions	2009-06-24 15:13:48 +09:00
kmemleak.c	kmemleak: Check for NULL pointer returned by create_object()	2009-10-09 13:28:47 -07:00
ksm.c	ksm: more on default values	2009-10-08 07:36:38 -07:00
maccess.c	[S390] maccess: add weak attribute to probe_kernel_write	2009-06-12 10:27:37 +02:00
madvise.c	Merge branch 'hwpoison' of git://git.kernel.org/pub/scm/linux/kernel/git/ak/linux-mce-2.6	2009-09-24 07:53:22 -07:00
Makefile	procfs: disable per-task stack usage on NOMMU	2009-09-24 17:11:24 -07:00
memcontrol.c	memcg: reduce check for softlimit excess	2009-10-01 16:11:13 -07:00
memory_hotplug.c	walk system ram range	2009-09-23 07:39:41 -07:00
memory-failure.c	hwpoison: fix oops on ksm pages	2009-10-29 07:39:24 -07:00
memory.c	Merge branch 'hwpoison-2.6.32' of git://git.kernel.org/pub/scm/linux/kernel/git/ak/linux-mce-2.6	2009-10-29 08:20:00 -07:00
mempolicy.c	do_mbind(): fix memory leak	2009-10-29 07:39:29 -07:00
mempool.c	mm: remove broken 'kzalloc' mempool	2009-09-22 07:17:35 -07:00
migrate.c	Merge branch 'hwpoison' of git://git.kernel.org/pub/scm/linux/kernel/git/ak/linux-mce-2.6	2009-09-24 07:53:22 -07:00
mincore.c
mlock.c	mm: m(un)lock avoid ZERO_PAGE	2009-09-22 07:17:40 -07:00
mm_init.c
mmap.c	const: mark struct vm_struct_operations	2009-09-27 11:39:25 -07:00
mmu_context.c	mm: reduce atomic use on use_mm fast path	2009-09-22 07:17:42 -07:00
mmu_notifier.c	ksm: add mmu_notifier set_pte_at_notify()	2009-09-22 07:17:31 -07:00
mmzone.c	[ARM] Double check memmap is actually valid with a memmap has unexpected holes V2	2009-05-18 11:22:24 +01:00
mprotect.c	perf: Do the big rename: Performance Counters -> Performance Events	2009-09-21 14:28:04 +02:00
mremap.c	truncate: new helpers	2009-09-24 08:41:47 -04:00
msync.c
nommu.c	NOMMU: Don't pass NULL pointers to fput() in do_mmap_pgoff()	2009-10-31 12:11:37 -07:00
oom_kill.c	oom: oom_kill doesn't kill vfork parent (or child)	2009-09-22 07:17:39 -07:00
page_alloc.c	revert "mm: oom analysis: add buffer cache information to show_free_areas()"	2009-10-29 07:39:27 -07:00
page_cgroup.c	memory hotplug: alloc page from other node in memory online	2009-09-22 07:17:26 -07:00
page_io.c	mm: remove file argument from swap_readpage()	2009-06-16 19:47:44 -07:00
page_isolation.c
page-writeback.c	writeback: account IO throttling wait as iowait	2009-10-09 12:40:42 +02:00
pagewalk.c
percpu.c	percpu: allow pcpu_alloc() to be called with IRQs off	2009-10-29 00:25:59 +09:00
prio_tree.c
quicklist.c	cpumask: use new-style cpumask ops in mm/quicklist.	2009-09-24 09:34:52 +09:30
readahead.c	readahead: introduce context readahead algorithm	2009-06-16 19:47:30 -07:00
rmap.c	mm/rmap.c: fix comment	2009-10-01 16:11:12 -07:00
shmem_acl.c	shmfs: use 'check_acl' instead of 'permission'	2009-09-08 11:08:46 -07:00
shmem.c	const: mark struct vm_struct_operations	2009-09-27 11:39:25 -07:00
slab.c	mm: replace various uses of num_physpages by totalram_pages	2009-09-22 07:17:38 -07:00
slob.c	slab: remove duplicate kmem_cache_init_late() declarations	2009-08-06 11:36:25 +03:00
slub.c	mm: kmem_cache_create(): make it easier to catch NULL cache names	2009-09-22 07:17:33 -07:00
sparse-vmemmap.c	memory hotplug: alloc page from other node in memory online	2009-09-22 07:17:26 -07:00
sparse.c	memory hotplug: alloc page from other node in memory online	2009-09-22 07:17:26 -07:00
swap_state.c	mm: add_to_swap_cache() does not return -EEXIST	2009-09-22 07:17:35 -07:00
swap.c	mm: replace various uses of num_physpages by totalram_pages	2009-09-22 07:17:38 -07:00
swapfile.c	mm: remove incorrect swap_count() from try_to_unuse()	2009-11-02 09:44:41 -08:00
thrash.c	mm: pass mm to grab_swap_token	2009-06-23 12:50:05 -07:00
truncate.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6	2009-09-24 08:32:11 -07:00
util.c	Merge branches 'slab/documentation', 'slab/fixes', 'slob/cleanups' and 'slub/fixes' into for-linus	2009-06-17 08:30:15 +03:00
vmalloc.c	headers: remove sched.h from interrupt.h	2009-10-11 11:20:58 -07:00
vmscan.c	vmscan: order evictable rescue in LRU putback	2009-10-29 07:39:30 -07:00
vmstat.c	mm: vmstat: add isolate pages	2009-09-22 07:17:29 -07:00